com.google.gerrit.server.tools.ToolsCatalog Maven / Gradle / Ivy
// Copyright (C) 2010 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gerrit.server.tools;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.common.base.Strings;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.common.Version;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.NavigableMap;
import java.util.TreeMap;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.util.RawParseUtils;
/**
* Listing of all client side tools stored on this server.
*
* Clients may download these tools through our file server, as they are packaged with our own
* software releases.
*/
@Singleton
public class ToolsCatalog {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
private final NavigableMap toc;
@Inject
ToolsCatalog() throws IOException {
this.toc = readToc();
}
/**
* Lookup an entry in the tools catalog.
*
* @param name path of the item, relative to the root of the catalog.
* @return the entry; null if the item is not part of the catalog.
*/
@Nullable
public Entry get(@Nullable String name) {
if (Strings.isNullOrEmpty(name)) {
return null;
}
if (name.startsWith("/")) {
name = name.substring(1);
}
if (name.endsWith("/")) {
name = name.substring(0, name.length() - 1);
}
return toc.get(name);
}
private static NavigableMap readToc() throws IOException {
NavigableMap toc = new TreeMap<>();
final BufferedReader br =
new BufferedReader(new InputStreamReader(new ByteArrayInputStream(read("TOC")), UTF_8));
String line;
while ((line = br.readLine()) != null) {
if (line.length() > 0 && !line.startsWith("#")) {
final Entry e = new Entry(Entry.Type.FILE, line);
toc.put(e.getPath(), e);
}
}
final List all = new ArrayList<>(toc.values());
for (Entry e : all) {
String path = dirOf(e.getPath());
while (path != null) {
Entry d = toc.get(path);
if (d == null) {
d = new Entry(Entry.Type.DIR, 0755, path);
toc.put(d.getPath(), d);
}
d.children.add(e);
path = dirOf(path);
e = d;
}
}
final Entry top = new Entry(Entry.Type.DIR, 0755, "");
for (Entry e : toc.values()) {
if (dirOf(e.getPath()) == null) {
top.children.add(e);
}
}
toc.put(top.getPath(), top);
return Collections.unmodifiableNavigableMap(toc);
}
@Nullable
private static byte[] read(String path) {
String name = "root/" + path;
try (InputStream in = ToolsCatalog.class.getResourceAsStream(name)) {
if (in == null) {
return null;
}
final ByteArrayOutputStream out = new ByteArrayOutputStream();
final byte[] buf = new byte[8192];
int n;
while ((n = in.read(buf, 0, buf.length)) > 0) {
out.write(buf, 0, n);
}
return out.toByteArray();
} catch (Exception e) {
logger.atFine().withCause(e).log("Cannot read %s", path);
return null;
}
}
@Nullable
private static String dirOf(String path) {
final int s = path.lastIndexOf('/');
return s < 0 ? null : path.substring(0, s);
}
/** A file served out of the tools root directory. */
public static class Entry {
public enum Type {
DIR,
FILE
}
private final Type type;
private final int mode;
private final String path;
private final List children;
Entry(Type type, String line) {
int s = line.indexOf(' ');
String mode = line.substring(0, s);
String path = line.substring(s + 1);
this.type = type;
this.mode = Integer.parseInt(mode, 8);
this.path = path;
if (type == Type.FILE) {
this.children = Collections.emptyList();
} else {
this.children = new ArrayList<>();
}
}
Entry(Type type, int mode, String path) {
this.type = type;
this.mode = mode;
this.path = path;
this.children = new ArrayList<>();
}
public Type getType() {
return type;
}
/** Returns the preferred UNIX file mode, e.g. {@code 0755}. */
public int getMode() {
return mode;
}
/** Returns path of the entry, relative to the catalog root. */
public String getPath() {
return path;
}
/** Returns the name of the entry, within its parent directory. */
public String getName() {
final int s = path.lastIndexOf('/');
return s < 0 ? path : path.substring(s + 1);
}
/** Returns collection of entries below this one, if this is a directory. */
public List getChildren() {
return Collections.unmodifiableList(children);
}
/** Returns a copy of the file's contents. */
public byte[] getBytes() {
byte[] data = read(getPath());
if (isScript(data)) {
// Embed Gerrit's version number into the top of the script.
//
final String version = Version.getVersion();
final int lf = RawParseUtils.nextLF(data, 0);
if (version != null && lf < data.length) {
byte[] versionHeader = Constants.encode("# From Gerrit Code Review " + version + "\n");
ByteArrayOutputStream buf = new ByteArrayOutputStream();
buf.write(data, 0, lf);
buf.write(versionHeader, 0, versionHeader.length);
buf.write(data, lf, data.length - lf);
data = buf.toByteArray();
}
}
return data;
}
private boolean isScript(byte[] data) {
return data != null
&& data.length > 3 //
&& data[0] == '#' //
&& data[1] == '!' //
&& data[2] == '/';
}
}
}